diff --git a/Samples/ResourceManagement/cpp/cpp-console-unpackaged/console_unpackaged_app.cpp b/Samples/ResourceManagement/cpp/cpp-console-unpackaged/console_unpackaged_app.cpp
index 47dec4185..6515684ef 100644
--- a/Samples/ResourceManagement/cpp/cpp-console-unpackaged/console_unpackaged_app.cpp
+++ b/Samples/ResourceManagement/cpp/cpp-console-unpackaged/console_unpackaged_app.cpp
@@ -8,11 +8,13 @@
 #include "winrt\Windows.Foundation.h"
 #include "winrt\Windows.Foundation.Collections.h"
 #include "winrt\Microsoft.Windows.ApplicationModel.Resources.h"
+#include "winrt\Microsoft.Windows.Globalization.h"
 
 #include <MddBootstrap.h>
 
 using namespace winrt;
 using namespace winrt::Microsoft::Windows::ApplicationModel::Resources;
+using namespace winrt::Microsoft::Windows::Globalization;
 
 int wmain(int argc, wchar_t* argv[])
 {
@@ -27,9 +29,11 @@ int wmain(int argc, wchar_t* argv[])
             "       Default or default\n"
             "       Override or override\n"
             "       Fallback or fallback\n"
+            "       PrimaryLanguageOverride or primarylanguageoverride\n"
             "  Default and override retrieve a sample string from string resource files.\n"
             "  For the override case, this sample uses the German language.\n"
             "  Fallback corresponds to the resource-not-found case, where we fallback to a legacy resource loader.\n"
+            "  PrimaryLanguageOverride uses ApplicationLanguages.PrimaryLanguageOverride property to override the language to German.\n"
             "\n"
             "Examples:\n"
             "  Get the sample string for the default resource context\n"
@@ -37,8 +41,10 @@ int wmain(int argc, wchar_t* argv[])
             "  Get the sample string for the override resource context (sample uses the German language for the override context)\n"
             "    console_unpackaged_app.exe override\n"
             "  Get the sample string for the resource-not-found fallback case\n"
-            "    console_unpackaged_app.exe fallback\n";
-        return 1;
+            "    console_unpackaged_app.exe fallback\n"
+            "  Get the sample string for the language overriden with ApplicationLanguages.PrimaryLanguageOverride (sample uses the German language)\n"
+            "    console_unpackaged_app.exe primarylanguageoverride\n";
+            return 1;
     }
 
     // Required for C++/WinRT. This call associates this thread with an apartment and initializes COM runtime.
@@ -76,6 +82,11 @@ int wmain(int argc, wchar_t* argv[])
     {
         std::wcout << manager.MainResourceMap().GetValue(L"Resources/LegacyString").ValueAsString().c_str() << std::endl;
     }
+    else if ((_wcsicmp(argv[1], L"PrimaryLanguageOverride") == 0) || (_wcsicmp(argv[1], L"primarylanguageoverride") == 0))
+    {
+        ApplicationLanguages::PrimaryLanguageOverride(L"de-DE");
+        std::wcout << manager.MainResourceMap().GetValue(L"Resources/SampleString").ValueAsString().c_str() << std::endl;
+    }
     else
     {
         std::wcout << "Invalid argument!" << std::endl;
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/App.xaml b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/App.xaml
new file mode 100644
index 000000000..1371d633a
--- /dev/null
+++ b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/App.xaml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Application
+    x:Class="PrimaryLanguageOverride.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:PrimaryLanguageOverride">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
+                <!-- Other merged dictionaries here -->
+            </ResourceDictionary.MergedDictionaries>
+            <!-- Other app resources here -->
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/App.xaml.cs b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/App.xaml.cs
new file mode 100644
index 000000000..dc272f60c
--- /dev/null
+++ b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/App.xaml.cs
@@ -0,0 +1,87 @@
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Navigation;
+using Microsoft.UI.Xaml.Shapes;
+using Microsoft.Windows.ApplicationModel.Resources;
+using Microsoft.Windows.Globalization;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.ApplicationModel;
+using Windows.ApplicationModel.Activation;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace PrimaryLanguageOverride
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    public partial class App : Application
+    {
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            // Set the primary language override to German (Germany)
+            // This will cause the app to use the German (Germany) resources
+            // Both resources loaded manually with ResourceLoader and XAML resources fetched with x:Uid will be in German (Germany)
+            ApplicationLanguages.PrimaryLanguageOverride = "de-DE";
+
+            this.InitializeComponent();
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched.
+        /// </summary>
+        /// <param name="args">Details about the launch request and process.</param>
+        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        {
+            m_resourceLoader = new ResourceLoader();
+
+            m_window = new MainWindow(m_resourceLoader);
+            m_window.Activate();
+
+            // Get the Window's HWND
+            var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(m_window);
+
+            m_window.Title = "MRT Core PrimaryLanguageOverride sample";
+            m_window.Activate();
+
+            // The Window object doesn't have Width and Height properties in WInUI 3 Desktop yet.
+            // To set the Width and Height, you can use the Win32 API SetWindowPos.
+            // Note, you should apply the DPI scale factor if you are thinking of DPI instead of pixels.
+            SetWindowSize(hwnd, 350, 300);
+        }
+        private void SetWindowSize(IntPtr hwnd, int width, int height)
+        {
+            var dpi = GetDpiForWindow(hwnd);
+            float scalingFactor = (float)dpi / 96;
+            width = (int)(width * scalingFactor);
+            height = (int)(height * scalingFactor);
+
+            SetWindowPos(hwnd, System.IntPtr.Zero, 0, 0, width, height, 2);
+        }
+
+        [DllImport("user32.dll", SetLastError = true)]
+        static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, int uFlags);
+
+        [DllImport("user32.dll", SetLastError = true)]
+        static extern uint GetDpiForWindow(IntPtr hWnd);
+
+        private ResourceLoader m_resourceLoader;
+        private Window m_window;
+    }
+}
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/LockScreenLogo.scale-200.png b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/LockScreenLogo.scale-200.png
new file mode 100644
index 000000000..7440f0d4b
Binary files /dev/null and b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/LockScreenLogo.scale-200.png differ
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/SplashScreen.scale-200.png b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/SplashScreen.scale-200.png
new file mode 100644
index 000000000..32f486a86
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diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Square150x150Logo.scale-200.png b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Square150x150Logo.scale-200.png
new file mode 100644
index 000000000..53ee3777e
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diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Square44x44Logo.scale-200.png b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Square44x44Logo.scale-200.png
new file mode 100644
index 000000000..f713bba67
Binary files /dev/null and b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Square44x44Logo.scale-200.png differ
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Square44x44Logo.targetsize-24_altform-unplated.png b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Square44x44Logo.targetsize-24_altform-unplated.png
new file mode 100644
index 000000000..dc9f5bea0
Binary files /dev/null and b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Square44x44Logo.targetsize-24_altform-unplated.png differ
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/StoreLogo.png b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/StoreLogo.png
new file mode 100644
index 000000000..a4586f26b
Binary files /dev/null and b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/StoreLogo.png differ
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Wide310x150Logo.scale-200.png b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Wide310x150Logo.scale-200.png
new file mode 100644
index 000000000..8b4a5d0dd
Binary files /dev/null and b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Assets/Wide310x150Logo.scale-200.png differ
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/MainWindow.xaml b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/MainWindow.xaml
new file mode 100644
index 000000000..4543b96e6
--- /dev/null
+++ b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/MainWindow.xaml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Window
+    x:Class="PrimaryLanguageOverride.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:PrimaryLanguageOverride"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <StackPanel Orientation="Vertical" HorizontalAlignment="Left" VerticalAlignment="Top">
+        <Button x:Uid="SampleButton" Click="SampleButton_Click" Width="300" Margin="20,20,0,0">PrimaryLanguageOverride sample</Button>
+        <TextBox x:Name="output" Width="300" Margin="20,20,0,0" Text="" />
+    </StackPanel>
+</Window>
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/MainWindow.xaml.cs b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/MainWindow.xaml.cs
new file mode 100644
index 000000000..b5a60b32f
--- /dev/null
+++ b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/MainWindow.xaml.cs
@@ -0,0 +1,42 @@
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Navigation;
+using Microsoft.Windows.ApplicationModel.Resources;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace PrimaryLanguageOverride
+{
+    /// <summary>
+    /// An empty window that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class MainWindow : Window
+    {
+        public MainWindow(ResourceLoader resourceLoader)
+        {
+            m_resourceLoader = resourceLoader;
+
+            this.InitializeComponent();
+        }
+
+        private void SampleButton_Click(object sender, RoutedEventArgs e)
+        {
+            var resourceString = m_resourceLoader.GetString("SampleString");
+            output.Text = resourceString;
+        }
+
+        private ResourceLoader m_resourceLoader;
+    }
+}
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/PrimaryLanguageOverride.csproj b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/PrimaryLanguageOverride.csproj
new file mode 100644
index 000000000..7f6a5755d
--- /dev/null
+++ b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/PrimaryLanguageOverride.csproj
@@ -0,0 +1,51 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+    <RootNamespace>PrimaryLanguageOverride</RootNamespace>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <Platforms>x86;x64;ARM64</Platforms>
+    <RuntimeIdentifiers Condition="$([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)')) &gt;= 8">win-x86;win-x64;win-arm64</RuntimeIdentifiers>
+    <RuntimeIdentifiers Condition="$([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)')) &lt; 8">win10-x86;win10-x64;win10-arm64</RuntimeIdentifiers>
+    <PublishProfile>win-$(Platform).pubxml</PublishProfile>
+    <UseWinUI>true</UseWinUI>
+    <EnableMsixTooling>true</EnableMsixTooling>
+		<WindowsSdkPackageVersion>10.0.19041.35-preview</WindowsSdkPackageVersion>
+		<WindowsPackageType>None</WindowsPackageType>
+	</PropertyGroup>
+
+  <ItemGroup>
+    <Content Include="Assets\SplashScreen.scale-200.png" />
+    <Content Include="Assets\LockScreenLogo.scale-200.png" />
+    <Content Include="Assets\Square150x150Logo.scale-200.png" />
+    <Content Include="Assets\Square44x44Logo.scale-200.png" />
+    <Content Include="Assets\Square44x44Logo.targetsize-24_altform-unplated.png" />
+    <Content Include="Assets\StoreLogo.png" />
+    <Content Include="Assets\Wide310x150Logo.scale-200.png" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.7.20240605-1229-Dev" />
+    <Manifest Include="$(ApplicationManifest)" />
+  </ItemGroup>
+
+  <!--
+    Defining the "Msix" ProjectCapability here allows the Single-project MSIX Packaging
+    Tools extension to be activated for this project even if the Windows App SDK Nuget
+    package has not yet been restored.
+  -->
+  <ItemGroup Condition="'$(DisableMsixProjectCapabilityAddedByProject)'!='true' and '$(EnableMsixTooling)'=='true'">
+    <ProjectCapability Include="Msix" />
+  </ItemGroup>
+
+  <!--
+    Defining the "HasPackageAndPublishMenuAddedByProject" property here allows the Solution
+    Explorer "Package and Publish" context menu entry to be enabled for this project even if
+    the Windows App SDK Nuget package has not yet been restored.
+  -->
+  <PropertyGroup Condition="'$(DisableHasPackageAndPublishMenuAddedByProject)'!='true' and '$(EnableMsixTooling)'=='true'">
+    <HasPackageAndPublishMenu>true</HasPackageAndPublishMenu>
+  </PropertyGroup>
+</Project>
\ No newline at end of file
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/PrimaryLanguageOverride.sln b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/PrimaryLanguageOverride.sln
new file mode 100644
index 000000000..688da24eb
--- /dev/null
+++ b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/PrimaryLanguageOverride.sln
@@ -0,0 +1,43 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.10.34928.147
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PrimaryLanguageOverride", "PrimaryLanguageOverride.csproj", "{A7EE0A53-508D-4350-A184-A08F82DE050E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|ARM64 = Debug|ARM64
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|ARM64 = Release|ARM64
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Debug|ARM64.ActiveCfg = Debug|ARM64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Debug|ARM64.Build.0 = Debug|ARM64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Debug|ARM64.Deploy.0 = Debug|ARM64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Debug|x64.ActiveCfg = Debug|x64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Debug|x64.Build.0 = Debug|x64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Debug|x64.Deploy.0 = Debug|x64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Debug|x86.ActiveCfg = Debug|x86
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Debug|x86.Build.0 = Debug|x86
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Debug|x86.Deploy.0 = Debug|x86
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Release|ARM64.ActiveCfg = Release|ARM64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Release|ARM64.Build.0 = Release|ARM64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Release|ARM64.Deploy.0 = Release|ARM64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Release|x64.ActiveCfg = Release|x64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Release|x64.Build.0 = Release|x64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Release|x64.Deploy.0 = Release|x64
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Release|x86.ActiveCfg = Release|x86
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Release|x86.Build.0 = Release|x86
+		{A7EE0A53-508D-4350-A184-A08F82DE050E}.Release|x86.Deploy.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {98D0CE59-33E6-43A6-BC91-9333B95F7057}
+	EndGlobalSection
+EndGlobal
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Strings/de-de/Resources.resw b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Strings/de-de/Resources.resw
new file mode 100644
index 000000000..b7a671d70
--- /dev/null
+++ b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Strings/de-de/Resources.resw
@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="SampleButton.Content" xml:space="preserve">
+    <value>Deutscher Buttontext</value>
+  </data>
+  <data name="SampleString" xml:space="preserve">
+    <value>Deutscher Text</value>
+  </data>
+</root>
\ No newline at end of file
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Strings/en-us/Resources.resw b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Strings/en-us/Resources.resw
new file mode 100644
index 000000000..578859317
--- /dev/null
+++ b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/Strings/en-us/Resources.resw
@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="SampleButton.Content" xml:space="preserve">
+    <value>English Button Text</value>
+  </data>
+  <data name="SampleString" xml:space="preserve">
+    <value>English Text</value>
+  </data>
+</root>
\ No newline at end of file
diff --git a/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/app.manifest b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/app.manifest
new file mode 100644
index 000000000..5a81b08c0
--- /dev/null
+++ b/Samples/ResourceManagement/cs/cs-winui-unpackaged/PrimaryLanguageOverride/app.manifest
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="PrimaryLanguageOverride.app"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- The ID below informs the system that this application is compatible with OS features first introduced in Windows 10. 
+      It is necessary to support features in unpackaged applications, for example the custom titlebar implementation.
+      For more info see https://docs.microsoft.com/windows/apps/windows-app-sdk/use-windows-app-sdk-run-time#declare-os-compatibility-in-your-application-manifest -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+  
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+    </windowsSettings>
+  </application>
+</assembly>
\ No newline at end of file